Comment by MrksHfmn

I also host my mail server on a hetzner server since the mid 2010s. As long as you familiarize yourself with the mechanisms (dkim, dmarc, spf, etc.) and have a mail-tester.com 10/10 score and sometimes look at mxtoolbox, it is absolutely doable. My only major issues were sending to gmail, t-online (telekom) and outlook addresses. But there are also ways to unlock the ip addresses and the delivery team at outlook.com was very helpful.